what caused the nawalparasi crash?

The recent bus crash in Nawalparasi involved a passenger bus traveling from Nepalgunj to Kathmandu that overturned in Daunne, Nawalparasi East. This tragic accident resulted in 6 deaths and around 10 injuries, with some passengers in serious condition. However, the specific cause of the crash has not been detailed in the news reports yet, and investigations are likely underway to determine what exactly triggered the accident.